US2511761A - Manufacture of prestressed - Google Patents
Manufacture of prestressed Download PDFInfo
- Publication number
- US2511761A US2511761A US2511761DA US2511761A US 2511761 A US2511761 A US 2511761A US 2511761D A US2511761D A US 2511761DA US 2511761 A US2511761 A US 2511761A
- Authority
- US
- United States
- Prior art keywords
- wires
- tension
- plate
- wire
- anchorage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/06—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed for the production of elongated articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S29/00—Metal working
- Y10S29/042—Tension applied during working
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S52/00—Static structures, e.g. buildings
- Y10S52/07—Synthetic building materials, reinforcements and equivalents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T24/00—Buckles, buttons, clasps, etc.
- Y10T24/39—Cord and rope holders
- Y10T24/3969—Sliding part or wedge
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/38—Laterally related rods independently joined to transverse surface
Definitions
- This invention consists of improvements in the manufacture of pie-stressed reinforced concrete sleepers and like: beams and deals particularly with the means for applying tension to reinforcing, wires before a casting operation and for releivingx the external tension on said wires when the castconcrete has set and hardened.
- sleepers is used to includezrailway sleepers and similar beams.
- sleepers it is customary to employ mass production methods: thus long production lines are arranged to' accommodate a large number of sleeper moulds in series.
- step ' is. to* arrange the reinforcingswires in the-productionlines and toapply tension thereto.
- the distribution of reinforcing wires over the cross-section of thesleeper is a matter of choice or designbut one; known scheme is to use the wires in pairs .andto-Lemploy: anumber of such pairs (say '7v to 12'pairs).
- At one end of each production line'the ends of the wiresmay be made fastwhil e. at the other end means are provided .fOIi applying and hrelieving tension.
- tensioning end are threaded anchorage; platewhich. is' capable of sliding Iongitudinally in fixed guides.
- The. tensioning ofxthe reinforcing wires in this known method. is: carried out intwo stages.
- each wire or pair of wires is given a preliminarytension and is secured to the anchorage. plate rsay by the action oi wedges.
- the tension is ap- If the wires are used singly, i; e; separated from one another, the desired tension maybe applied to one wire at a time. 'Iraccording-to the usual custom the wires are-used"in" contiguous pairs,
- the desired tension may be applied to each pair, onepair at a time.
- Thishead carries one or more hori- J zontally-extending' strong brackets which proand is separated from the head by several (say 3 or 4) stout adjusting screws.
- Each wire anchorageplatea. is-provided with orifices through :which reinforcing; wires (generally in pairs) are Ida, the uppermost screw I8 of each plate I! bearing against the associated section I la.
- Each hole I9 through the anchorage plate I! conveniently accommodates a pair of wires 20 and one method of securing a pair of wires in the anchorage plate I I is to force a wedge 2
- means may be provided for applying the tension to wires symmetrically on both sides of the vertical median line of the wire-anchorage plate. It will be understood that while the tension is being applied and while it is being maintained, the screws which secure the wireanchorage plate in relation to the head are not moved or adjusted: in other words the pedestal, head and wire-anchorage plate are rigid.
- the method of releasing the external tension on the wires is to turn the adjusting screws-so as to allow the wire-anchorage plate to approach the head from which it is carried.
- the release of external tension of the wires is allowed to take place gradually and uniformlyand there is no necessity to apply any further or additional tension to the wires.
- the wires can be released from the wire-anchora e plate by removal of the ferrules, wedges or like securing devices.
- the anchorage plate must be withdrawn to therequisite extent by the action of the adjusting screws.
- Figure 1 is a front elevation
- Figure 2 is a side elevation
- Fig. 3 is a plan, showing the head, pedestal and tensioning means, other parts being omitted,
- Figure 4 is a section on an enlarged scale through one of the holes in the anchorage plate showing the disposition of a pair of wires and the wedge which secures them, and
- Figure 5 is a diagram of the production lines.
- the pedestal is formed by the upright rolled steel joists I2. joined by horizontal joists I3.
- the head comprises eight short upright sections I 4 of rolled steel joists secured to the horizontal joists I3.
- a stout horizontal bracket I5 is secured to each pair of upright'sections I4 and on this bracket I5 (which has guiding fillets I6) there slides a wire-anchorage plate I! which is separated from the head by three stout adjusting screws I8.
- the horizontally spaced lower adjusting screws I8 bear against upright sections I4 and the upper screw I8 bears against filler block Ma. which rests against upper joist I3.
- Between Separate means may be provided for supplying and guiding the reinforcing wires to the wireanchorage plate, and when a complete group of wires has been threaded through the holes in the anchorage plate, that group of wires is pulled along the production line by a haulage rope where it is threaded through the head and the anchorage plate at the other end of the production line.
- wire-anchorage plates I! are shown in an intermediate position of their possible travel but it will be understood that at the time when the tension is applied to the wires, the wire-anchorage plates (by means of the screw adjustment) are withdrawn some distance from the head I4 so that after the concrete in the moulds has set and hardened and the external tension on the wires has to be relieved, there is ample room for the movement of the wire-anchorage plate towards the head.
- moulds 25 are arranged in long straight series and the reinforcing wires 26 pass through the moulds and through the end plates thereof so that when a mould has been filled with concrete the reinforced wires are embedded in the concrete in the mould.
- the devices of this invention viz., the joists I2, I3, I4, the brackets I5, the wire-anchorage plate I7 and adjusting screws I8 are shown only on the right-hand side of the drawing, but it will be I understood that there is a similar arrangement at the opposite end of the production lines.
- transverse rails 21 on which a wire-tensioning truck 28 can be moved so that the tensioning device thereon (e. g., a fluid-operated ram) can be brought into line with any production line and the truck 28 can then be clamped to the rails 21.
- the tensioning device thereon e. g., a fluid-operated ram
- Apparatus for the manufacture of prestressed reinforced concrete sleepers comprisingmechanism for maintaining under tension for a desired period of time, and thereafter releasing, an intermediate section of each of a plurality of each two adjacent upright rolled sections I4 is o a ed parallel Wires Which 13888 through a secured a horizontally extending rolled section plurality of aligned concrete moulds and whichwires have been initially placed under tension by other means, said mechanism comprising opposed horizontally spaced wire gripping, holding and releasing devices, one such device including an immovable supporting part or standard having a surface disposed substantially in a vertical plane transverse to the direction in which the wires extend and a substantially horizontally disposed plate supporting surface, a stout wire anchorage plate slidably resting upon the plate supporting surface of said standard, said plate being disposed substantially parallel to the vertical surface of the supporting standard and having a series of horizontally extending apertures therein through which the parallel Wires under tension pass, a releasable wire securing element
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB15923/43A GB581815A (en) | 1943-09-28 | 1943-09-28 | Improvements in the manufacture of prestressed concrete sleepers and like beams |
Publications (1)
Publication Number | Publication Date |
---|---|
US2511761A true US2511761A (en) | 1950-06-13 |
Family
ID=10067972
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US2511761D Expired - Lifetime US2511761A (en) | 1943-09-28 | Manufacture of prestressed |
Country Status (3)
Country | Link |
---|---|
US (1) | US2511761A (de) |
BE (1) | BE459598A (de) |
GB (1) | GB581815A (de) |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2637895A (en) * | 1942-03-21 | 1953-05-12 | Emile Jules Lucien Blaton | Method of tensioning and anchoring wire bundles for prestressed concrete structural elements |
US2689999A (en) * | 1950-05-26 | 1954-09-28 | Concrete Products Co | Apparatus for manufacturing prestressed concrete structural units |
US2763464A (en) * | 1952-07-26 | 1956-09-18 | Leonhardt Fritz | Apparatus for anchorage of concrete reinforcements |
US2804893A (en) * | 1953-06-08 | 1957-09-03 | Carl F Spickelmier | Power actuated block clamping apparatus and method |
US2820606A (en) * | 1952-10-15 | 1958-01-21 | Valenzuela Ricardo Barredo De | Tensioning system |
US2827679A (en) * | 1947-01-23 | 1958-03-25 | Blaton Armand Eugene Adolphe | Wire anchoring device |
US2863206A (en) * | 1952-08-27 | 1958-12-09 | Kirchner Ignatz Adolf | Apparatus for prestressing reinforcing wires for reinforced concrete parts in mass production |
US2886875A (en) * | 1956-11-14 | 1959-05-19 | Concrete Technology Corp | Apparatus and method for releasing loads on stressing beds for making prestressed concrete |
DE1059820B (de) * | 1952-12-29 | 1959-06-18 | Wilhelm Ludowici Dr Ing | Einrichtung zum Spannen der Bewehrungsdraehte von Bauteilen |
US2948042A (en) * | 1955-03-14 | 1960-08-09 | Ben C Gerwick Inc | Apparatus for making hollow reinforced concrete bodies |
US2949655A (en) * | 1957-02-11 | 1960-08-23 | Jose A Berumen | Method and apparatus for making prestressed spun concrete articles |
US3041702A (en) * | 1957-10-15 | 1962-07-03 | United States Steel Corp | Method of making a prestressed reinforced concrete structure |
US3472031A (en) * | 1967-11-06 | 1969-10-14 | Rai B Kelso | Precast concrete body |
US3478396A (en) * | 1968-01-04 | 1969-11-18 | Emerson Electric Co | Strand chuck |
US3778869A (en) * | 1971-03-15 | 1973-12-18 | American Stress Wire Corp | Apparatus for detensioning stranded cable |
US3965541A (en) * | 1973-08-23 | 1976-06-29 | Ccl Systems Limited | Reinforcing strand anchorage assembly |
US4526739A (en) * | 1982-02-04 | 1985-07-02 | Industria Prefabbricati Affini I.P.A. S.P.A. | Process and apparatus for precasting prestressed-concrete workpieces |
EP0289017A1 (de) * | 1987-04-29 | 1988-11-02 | S.C.A.C. SOCIETA CEMENTI ARMATI CENTRIFUGATI S.p.A. | Anlage zum Herstellen länglicher Elemente aus vorgespanntem verstärktem Beton |
EP4177028A1 (de) * | 2021-11-09 | 2023-05-10 | Elematic Oyj | Vorrichtung zum vorspannen von verstärkungssträngen |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE459598A (de) * | 1943-09-28 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US465169A (en) * | 1891-12-15 | Wire-tightener | ||
US791041A (en) * | 1905-03-27 | 1905-05-30 | John W Myers | Molding-flask. |
US1261590A (en) * | 1917-05-24 | 1918-04-02 | Charles M Moore | Wire-stretcher. |
GB338864A (en) * | 1928-10-02 | 1930-11-18 | Eugene Freyssinet | Process for the manufacture of articles of reinforced concrete |
US2171120A (en) * | 1938-05-21 | 1939-08-29 | Edwin W Bullard | Tie wire apparatus |
GB581815A (en) * | 1943-09-28 | 1946-10-25 | Dowsett Engineering Constructi | Improvements in the manufacture of prestressed concrete sleepers and like beams |
-
0
- BE BE459598D patent/BE459598A/xx unknown
- US US2511761D patent/US2511761A/en not_active Expired - Lifetime
-
1943
- 1943-09-28 GB GB15923/43A patent/GB581815A/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US465169A (en) * | 1891-12-15 | Wire-tightener | ||
US791041A (en) * | 1905-03-27 | 1905-05-30 | John W Myers | Molding-flask. |
US1261590A (en) * | 1917-05-24 | 1918-04-02 | Charles M Moore | Wire-stretcher. |
GB338864A (en) * | 1928-10-02 | 1930-11-18 | Eugene Freyssinet | Process for the manufacture of articles of reinforced concrete |
US2171120A (en) * | 1938-05-21 | 1939-08-29 | Edwin W Bullard | Tie wire apparatus |
GB581815A (en) * | 1943-09-28 | 1946-10-25 | Dowsett Engineering Constructi | Improvements in the manufacture of prestressed concrete sleepers and like beams |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2637895A (en) * | 1942-03-21 | 1953-05-12 | Emile Jules Lucien Blaton | Method of tensioning and anchoring wire bundles for prestressed concrete structural elements |
US2827679A (en) * | 1947-01-23 | 1958-03-25 | Blaton Armand Eugene Adolphe | Wire anchoring device |
US2689999A (en) * | 1950-05-26 | 1954-09-28 | Concrete Products Co | Apparatus for manufacturing prestressed concrete structural units |
US2763464A (en) * | 1952-07-26 | 1956-09-18 | Leonhardt Fritz | Apparatus for anchorage of concrete reinforcements |
US2863206A (en) * | 1952-08-27 | 1958-12-09 | Kirchner Ignatz Adolf | Apparatus for prestressing reinforcing wires for reinforced concrete parts in mass production |
US2820606A (en) * | 1952-10-15 | 1958-01-21 | Valenzuela Ricardo Barredo De | Tensioning system |
DE1059820B (de) * | 1952-12-29 | 1959-06-18 | Wilhelm Ludowici Dr Ing | Einrichtung zum Spannen der Bewehrungsdraehte von Bauteilen |
US2804893A (en) * | 1953-06-08 | 1957-09-03 | Carl F Spickelmier | Power actuated block clamping apparatus and method |
US2948042A (en) * | 1955-03-14 | 1960-08-09 | Ben C Gerwick Inc | Apparatus for making hollow reinforced concrete bodies |
US2886875A (en) * | 1956-11-14 | 1959-05-19 | Concrete Technology Corp | Apparatus and method for releasing loads on stressing beds for making prestressed concrete |
US2949655A (en) * | 1957-02-11 | 1960-08-23 | Jose A Berumen | Method and apparatus for making prestressed spun concrete articles |
US3041702A (en) * | 1957-10-15 | 1962-07-03 | United States Steel Corp | Method of making a prestressed reinforced concrete structure |
US3472031A (en) * | 1967-11-06 | 1969-10-14 | Rai B Kelso | Precast concrete body |
US3478396A (en) * | 1968-01-04 | 1969-11-18 | Emerson Electric Co | Strand chuck |
US3778869A (en) * | 1971-03-15 | 1973-12-18 | American Stress Wire Corp | Apparatus for detensioning stranded cable |
US3965541A (en) * | 1973-08-23 | 1976-06-29 | Ccl Systems Limited | Reinforcing strand anchorage assembly |
US4526739A (en) * | 1982-02-04 | 1985-07-02 | Industria Prefabbricati Affini I.P.A. S.P.A. | Process and apparatus for precasting prestressed-concrete workpieces |
EP0289017A1 (de) * | 1987-04-29 | 1988-11-02 | S.C.A.C. SOCIETA CEMENTI ARMATI CENTRIFUGATI S.p.A. | Anlage zum Herstellen länglicher Elemente aus vorgespanntem verstärktem Beton |
US4952129A (en) * | 1987-04-29 | 1990-08-28 | S.C.A.C. Societa Cementi Armati Centrifugati Spa | Plant to manufacture elongated elements of prestressed reinforced concrete |
EP4177028A1 (de) * | 2021-11-09 | 2023-05-10 | Elematic Oyj | Vorrichtung zum vorspannen von verstärkungssträngen |
Also Published As
Publication number | Publication date |
---|---|
GB581815A (en) | 1946-10-25 |
BE459598A (de) |
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